30°22′12′′＝30°﹢22′﹢12′′
22′＝﹙22／60﹚°＝﹙1320／3600﹚°
12″=﹙12／3600﹚°
30°22′12′′＝30°﹢22′﹢12′′
＝30°﹢﹙1320／3600﹚°﹢﹙12／3600﹚°
＝30°﹢0.37°
＝30.37°